US9515278B2ActiveUtilityA1

Light-emitting element, display module, lighting module, light-emitting device, display device, electronic device, and lighting device

Assignee: SEMICONDUCTOR ENERGY LABPriority: Aug 9, 2013Filed: Aug 6, 2014Granted: Dec 6, 2016

Est. expiryAug 9, 2033(~7.1 yrs left)· nominal 20-yr term from priority

Inventors:Tsunenori Suzuki Shogo Uesaka Ryohei Yamaoka Satoshi Seo

H01L 27/322H01L 2251/53H01L 27/3209H01L 51/5278H01L 51/0077H01L 51/5012H10K 50/805H10K 2102/302H10K 59/35H10K 59/38H10K 85/30H10K 85/342H10K 85/371H10K 85/615H10K 85/622H10K 85/626H10K 85/633H10K 85/6576H10K 85/6572H10K 59/32H10K 50/11H10K 50/19

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Claims

Abstract

A tandem light-emitting element in which generation of crosstalk can be suppressed even when the element is applied to a high-definition display is provided. In the tandem light-emitting element, a layer in contact the anode side of an intermediate layer contains 2,9-bis(naphthalen-2-yl)-4,7-diphenyl-1,10-phenanthroline (abbreviation: NBPhen).

Claims

exact text as granted — not AI-modified

What is claimed is:

1. A light-emitting element comprising:
a first electrode;
an EL layer over the first electrode; and
a second electrode over the EL layer,
wherein the EL layer comprises a first light-emitting unit, a first layer, a first charge generation layer, a second light-emitting unit, a second layer, and a second charge generation layer,
wherein each of the first charge generation layer and the second charge generation layer comprises lithium,
wherein the first layer is provided between the first light-emitting unit and the first charge generation layer,
wherein the second layer is provided between the second light-emitting unit and the second charge generation layer, and
wherein the first layer and the second layer each comprise 2,9-bis(naphthalen-2-yl)-4,7-diphenyl-1,10-phenanthroline.

2. The light-emitting element according to claim 1 , wherein the first charge generation layer comprises at least a charge generation region and an electron-injection buffer region.

3. The light-emitting element according to claim 2 , wherein an electron-relay region is provided between the charge generation region and the electron-injection buffer region.

4. The light-emitting element according to claim 2 , wherein the electron-injection buffer region comprises lithium.

5. The light-emitting element according to claim 1 ,
wherein the EL layer comprises a layer containing a condensed heteroaromatic compound,
wherein the layer containing a condensed heteroaromatic compound comprises iridium and a compound which comprises two nitrogen atoms in one condensed ring, and
wherein the layer containing a condensed heteroaromatic compound is in contact with the first layer.

6. The light-emitting element according to claim 5 ,
wherein the iridium is contained in part of the layer containing a condensed heteroaromatic compound and not contained in a region in contact with the first layer.

7. A light-emitting device comprising the light-emitting element according claim 1 and a unit configured to control the light-emitting element.

8. A display device comprising the light-emitting element according to claim 1 in a display portion and a unit configured to control the light-emitting element.

9. A lighting device comprising the light-emitting element according to claim 1 in a lighting portion and a unit configured to control the light-emitting element.

10. A light-emitting element comprising:
a first electrode;
an EL layer over the first electrode, the EL layer comprising:
a first light-emitting unit over the first electrode;
a first layer over the first light-emitting unit; and
a first charge generation layer over and in contact with the first layer, the first charge generation layer comprising lithium; and

a second electrode,
wherein the first layer comprises 2,9-bis(naphthalen-2-yl)-4,7-diphenyl-1,10-phenanthroline.

11. The light-emitting element according to claim 10 , wherein the first charge generation layer comprises at least a charge generation region and an electron-injection buffer region.

12. The light-emitting element according to claim 11 ,
wherein an electron-relay region is provided between the charge generation region and the electron-injection buffer region.

13. The light-emitting element according to claim 11 , wherein the electron-injection buffer region comprises lithium.

14. The light-emitting element according to claim 10 ,
wherein the EL layer comprises a layer containing a condensed heteroaromatic compound,
wherein the layer containing a condensed heteroaromatic compound comprises iridium and a compound which comprises two nitrogen atoms in one condensed ring, and
wherein the layer containing a condensed heteroaromatic compound is in contact with the first layer.

15. The light-emitting element according to claim 14 , wherein the iridium is contained in part of the layer containing a condensed heteroaromatic compound and not contained in a region in contact with the first layer.

16. A light-emitting device comprising the light-emitting element according claim 10 and a unit configured to control the light-emitting element.

17. A display device comprising the light-emitting element according to claim 10 in a display portion and a unit configured to control the light-emitting element.

18. A lighting device comprising the light-emitting element according to claim 10 in a lighting portion and a unit configured to control the light-emitting element.

19. A light-emitting element comprising:
a first electrode;
an EL layer over the first electrode, the EL layer comprising:
a hole-injection layer over the first electrode;
a hole-transport layer over the hole-injection layer;
a light-emitting layer over the hole-transport layer;
an electron-transport layer over the light-emitting layer, the electron-transport layer comprising a first layer; and
a first charge generation layer over the electron-transport layer, the first charge generation layer comprising lithium; and

a second electrode over the first charge generation layer,
wherein the first layer comprises 2,9-bis(naphthalen-2-yl)-4,7-diphenyl-1,10-phenanthroline.

20. The light-emitting element according to claim 19 , wherein the first charge generation layer comprises at least a charge generation region and an electron-injection buffer region.

21. The light-emitting element according to claim 20 , wherein an electron-relay region is provided between the charge generation region and the electron-injection buffer region.

22. The light-emitting element according to claim 20 , wherein the electron-injection buffer region comprises lithium.

23. The light-emitting element according to claim 19 ,
wherein the EL layer comprises a layer containing a condensed heteroaromatic compound,
wherein the layer containing a condensed heteroaromatic compound comprises iridium and a compound which comprises two nitrogen atoms in one condensed ring, and
wherein the layer containing a condensed heteroaromatic compound is in contact with the first layer.

24. The light-emitting element according to claim 23 , wherein the iridium is contained in part of the layer containing a condensed heteroaromatic compound and not contained in a region in contact with the first layer.

25. A light-emitting device comprising the light-emitting element according claim 19 and a unit configured to control the light-emitting element.

26. A display device comprising the light-emitting element according to claim 19 in a display portion and a unit configured to control the light-emitting element.

27. A lighting device comprising the light-emitting element according to claim 19 in a lighting portion and a unit configured to control the light-emitting element.

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